Current Hajj Rules against the Quranic Commandments
3:96 He erected the First House (Sanctuary) appointed for all mankind, at the blessed
Bakkah. It is to serve as a beacon of light for all humanity (in order to regain
their lost unity). [2:125. Bakkah came to be known as Makkah later. In the
ancient Arabic dialect B was interchangeable with M]
3:97 Therein are clear Messages (to achieve that coveted goal and recall) how Abraham
once took his stand (against all divisions of humanity and was granted the
leadership of all mankind 2:124-125). Those who enter the System symbolized
thereby shall find inner peace and external security. Pilgrimage to this House
is a duty all mankind owe to God, those who have the circumstantial means
to undertake the visit. One who denies this command should know that God
is absolutely Independent of all His creation. [Pilgrimage = Joining the Hajj
Convention. Mankind can realize the blessings of unity by rallying around this
Divinely appointed Center of Ideology. 22:25-28. The idolaters are forbidden
only to 'ya'mur' or administer the Masjid for obvious ideological reasons.
“There are four sacred months out of twelve months in the lunar (also known as Islamic or Hijri) calendar but there is dispute regarding the names of the sacred months despite a clear warning in the Quran that altering sacred months is a disbelief. However, there are three versions of sacred months: (a) 7th, 11th, 12th and 1st, (b) 9th, 10th, 11th and 12th, and (c) 12th, 1st, 2nd and 3rd. Of the three versions one of them is hadith based while the other two are in light of the Quran.”
 Hajj for entire mankind not only Muslims.[There are signs in Makkah beyond non Muslims are not allaowed.]
 Up till 250AH, used to be 4 months , the rulers used to provide protection for the caravans from the bandits. Around that time the Qaramatis started robbing the caravans, it became a logistical problem and financial burden for the rulers. May be the decision to reduce the four months to 10 days were adapted.
There may be many more rituals against the Quranic Commandments-you figure it out.